Technical Polycarbide or nylon Abrasive Wheels

I never used them . Do they work good for "nook and cranny"areas to try and remove rust ****? Or a waste of money.?
Should I buy some ?
I just been using steel wire wheels and sand paper by hand or disc grinders, and magician tricks.

 

I love mine.

 

Awesome for paint and rust removal. Also get the scotchbrite for mul***ools and angle grinder. Buy in bulk and treat them as consumables.